2645161640 has 96 divisors (see below), whose sum is σ = 6568800840. Its totient is φ = 957918720.

The previous prime is 2645161639. The next prime is 2645161669. The reversal of 2645161640 is 461615462.

It can be written as a sum of positive squares in 4 ways, for example, as 1300179364 + 1344982276 = 36058^2 + 36674^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2645161640.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1339694 + ... + 1341666.

Almost surely, 2^2645161640 is an apocalyptic number.

2645161640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2645161640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3284400420).

2645161640 is an abundant number, since it is smaller than the sum of its proper divisors (3923639200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645161640 is a wasteful number, since it uses less digits than its factorization.

2645161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 2645161640 is about 51431.1349281736. The cubic root of 2645161640 is about 1382.9847948866.

The spelling of 2645161640 in words is "two billion, six hundred forty-five million, one hundred sixty-one thousand, six hundred forty".